JP7292487B2 - Cemented carbide cutting blade - Google Patents

Description

The present disclosure relates to cemented carbide cutting blades. This application claims priority from Japanese Patent Application No. 2020-106058 filed on June 19, 2020. All the contents described in the Japanese patent application are incorporated herein by reference.

Conventionally, cutting blades, for example, JP-A-10-217181 (Patent Document 1), JP-A-2001-158016 (Patent Document 2), International Publication No. 2014/050883 (Patent Document 3), International Publication No. 2014 /050884 (Patent Document 4), JP-A-2017-42911 (Patent Document 5) and JP-A-2004-17444 (Patent Document 6).

JP-A-10-217181 Japanese Patent Application Laid-Open No. 2001-158016 WO2014/050883 WO2014/050884 JP 2017-42911 A JP-A-2004-17444

The cemented carbide cutting blade of the present disclosure includes a base and a blade having a shape that is provided on an extension of the base and has a shape that decreases in thickness toward the cutting edge, which is the most distal part. The thickness of the blade at a position of 3 μm is 0.26 μm or more and 7.00 μm or less, and the thickness of the blade at a position of X μm (X is an integer from 3 to 25) from the blade edge to the base is TX, from the blade edge to the base When the thickness of the blade portion at the position of X + 1 μm is TX1, the first blade thickness change amount TX1-TX is 0.08 μm or more and 1.85 μm or less for all integers of X from 3 to 25, and the blade length direction In a longitudinal section perpendicular to are also located outside.

FIG. 1 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 1. FIG. FIG. 2 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 2. As shown in FIG. FIG. 3 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 3. As shown in FIG. FIG. 4 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 4. As shown in FIG. FIG. 5 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 5. As shown in FIG. FIG. 6 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 6. As shown in FIG. FIG. 7 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 7. As shown in FIG. FIG. 8 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 8. As shown in FIG. FIG. 9 is a vertical cross-sectional view of a cemented carbide cutting blade 1 according to a ninth embodiment. FIG. 10 is a perspective view of the device for explaining the cutting test. 11 is a cross-sectional view taken along line XI--XI in FIG. 10. FIG. FIG. 12 is a microscope observation photograph (microscope) observation image showing chipping of the cutting blade.

[Problems to be Solved by the Present Disclosure]
If the blade thickness is thin, there is a problem that the cutting edge cannot withstand the cutting impact and chipping occurs. If the thickness of the blade is thick, there is a problem that the cutting resistance is high, the quality of the cross section is deteriorated, and the cross section becomes rough.

[Description of Embodiments of the Present Disclosure]
First, the embodiments of the present disclosure are listed and described.

[Details of the embodiment of the present disclosure]
(Material)
The material used for the cutting blade is a cemented carbide containing tungsten carbide and cobalt as main components. The content of cobalt used in cemented carbide is in the range of 3-25% by weight. The cobalt content is preferably in the range of 5 to 20% by mass.

The hardness of cemented carbide is in the range of 82-95 in HRA (Rockwell hardness). The composition of the elements constituting the cemented carbide is specified by ICP emission spectroscopic analysis and Co titration. In the cemented carbide in the present disclosure, the main components are tungsten carbide and cobalt. In addition, elements such as chromium, vanadium, tantalum, and niobium may be included in order to adjust characteristics such as grain size.

Preferably, the size of the tungsten carbide crystals in the cemented carbide is between 0.1 μm and 4 μm. More preferably, the crystal size is 2 μm or less.

Further, in order to control the crystal grains of tungsten carbide , it may contain a compound containing tantalum as a main component in order to suppress the growth of crystal grains. Its content is preferably 0.1 to 2% by mass. The additive for suppressing grain growth may be a vanadium-based compound or a chromium-based compound. The content of each of the compound containing tantalum as the main component, the compound containing vanadium as the main component, and the compound containing chromium as the main component is 0.1 to 2% by mass.

(shape)
The shape of the cutting blade is basically a rectangular plate shape. The thickness is the shortest side of the board.

The cemented carbide cutting blade includes a base and a cutting edge that is provided on an extension of the base and has a shape that decreases in thickness toward the cutting edge, which is the most distal portion.

Preferably, the thickness of the base is constant. The base has a thickness of 50 to 6000 μm, and the required thickness varies depending on the size of the cut product. A blade for cutting is formed on one side extending from the base. The dimension of the blade portion in the direction from the base toward the blade portion is expressed as the width of the blade portion (Z-axis direction). The length in the direction of blade length (X-axis direction) and the dimension in the direction perpendicular to the width direction of the blade portion are represented as the thickness of the blade portion (Y-axis direction).

In many cases, when used as a cutting blade, the length in the blade span direction is often 30 mm to 500 mm, and the width is often 10 to 30 mm.

The blade has a thickness of 0.26 μm or more and 7.00 μm or less at a position of 3 μm from the blade edge toward the base. If the thickness of the blade portion at this position is less than 0.26 μm, it becomes difficult to maintain the strength of the blade portion. Or it is too thin and cannot be manufactured. If the thickness of the blade portion at this position exceeds 7.00 μm, the cutting resistance increases.

When the thickness of the blade at a position X μm (X is an integer from 3 to 25) from the cutting edge toward the base is TX, and the thickness of the blade at a position X + 1 μm from the cutting edge toward the base is TX1, the first blade The thickness change amount TX1-TX is 0.08 μm or more and 1.85 μm or less where X is an integer of 3 to 25. If the amount of change in blade thickness is less than 0.08 μm, sufficient strength of the blade portion cannot be obtained, resulting in chipping. If the blade thickness variation exceeds 1.85 μm, the cutting resistance increases.

In a longitudinal section perpendicular to the blade length direction, the outer shape of the blade has an outwardly convex portion in a range of 25 μm from the cutting edge toward the base, and the convex portion connects the cutting edge and a position of 25 μm from the cutting edge toward the base. outside the straight line. Due to the presence of the convex portion, the strength of the blade portion can be increased compared to a straight cutting blade having no convex portion.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 1. FIG. As shown in FIG. 1, the cemented carbide cutting blade 1 has a cutting edge 121t extending in the blade span direction. FIG. 1 is a cross section in a direction orthogonal to the blade extension direction.

The cemented carbide cutting blade 1 has a base portion 110 and a blade portion 120 connected to the base portion 110 . Blade 120 has a first portion 121 . The tip portion of the first portion 121 is the cutting edge 121t.

The thickness (Y-axis direction) of the blade portion 120 gradually decreases from the base portion 110 toward the blade edge 121t. The thickness at a point 203 having a dimension of 3 μm in the length direction (Z-axis direction) from the cutting edge 121t is T1. The thickness at point 225, which is 25 μm in length from the cutting edge 121t, is T2. The thickness at a point 20X having a lengthwise dimension of X μm from the cutting edge 121t is TX. The thickness at the point 20X1, which is X+1 μm in the length direction from the cutting edge 121t, is TX1.

The protrusion 120t is located outside the straight line S connecting the point 225 and the cutting edge 121t. The protrusion 120t is provided on the outer surface 121s. A straight line 325 is drawn on the outer surface 121s at the point 225, and the angle formed by the two straight lines 325 is θ. The slope of straight line 325 is half the amount of change in blade thickness at point 225 . The direction perpendicular to the Y-axis and Z-axis directions is the blade length direction.

The outer surface 121s has a curved shape. The angle formed by the tangent line on the outer surface 121s increases as it approaches the cutting edge 121t. 121 s of outer surfaces are bilaterally symmetrical with respect to the centerline C in this embodiment. However, the outer surface 121s may be asymmetrical with respect to the centerline C.

The outer surface 121 s is gently curved to connect the cutting edge 121 t and the base 110 . The angle between the outer surface 121s and the center line C increases as the cutting edge 121t is approached. The blade portion 120 may be curved only in the range of 3 to 25 μm in the Z-axis direction, and the base portion 110 side of the curved portion may be linear.

The cutting object of the cemented carbide cutting blade 1 is, for example, unfired ceramics or glass such as laminated capacitors or laminated inductors, metal green sheets, metal foils, paper, fibers, or hard resins.

The cemented carbide cutting blade 1 includes a base portion 110 and a blade portion 120 which is provided on an extension line of the base portion 110 and has a shape whose thickness decreases toward a cutting edge 121t which is the most distal portion. In all the following embodiments, the following relationships (1), (2) and (3) hold.

(1) A thickness T1 of the blade portion 120 at a position of 3 μm from the blade edge 121t toward the base portion 110 is 0.26 μm or more and 7.00 μm or less.

(2) TX is the thickness of the blade portion at a position of X μm (X is an integer from 3 to 25) from the cutting edge 121t toward the base portion 110, and TX1 is the thickness of the blade portion 120 at a position of X+1 μm from the blade edge 121t toward the base portion 110. , the first blade thickness change amount TX1-TX is 0.08 μm or more and 1.85 μm or less where X is an integer of 3 to 25.

(3) In a longitudinal section orthogonal to the blade span direction, the outer shape of the blade portion 120 has an outwardly convex portion 120t in a range of 25 μm from the blade edge 121t toward the base portion 110, and the convex portion 120t is the blade edge 121t and the blade edge 121t. , toward the base portion 110, outside the straight line S connecting the positions of 25 μm.

More preferably, the first blade thickness change amount when X is 3 is 0.26 μm or more and 0.93 μm or less.

(Embodiment 2)
FIG. 2 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 2. As shown in FIG. As shown in FIG. 2, in the cemented carbide cutting blade 1 according to Embodiment 2, the outer surface 121s is curved in that the outer surfaces 121s, 122s, and 123s are stepped. differs from the cemented carbide cutting blade 1 according to form 1 of . All of the outer surfaces 121s, 122s, and 123s of the three-stage blade portion 120 are linear. The angles formed by the outer surfaces 121s, 122s, and 123s with respect to the center line C are the largest at the outer surface 121s near the cutting edge 121t and the smallest at the outer surface 123s near the base 110. FIG.

A point 225 at a distance of 25 μm from the cutting edge 121 t in the Z-axis direction exists on the first portion 121 . In this embodiment, the projection 120t has a rectangular shape, but the projection 120t may have a curved shape.

(Embodiment 3)
FIG. 3 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 3. As shown in FIG. As shown in FIG. 3, in the cemented carbide cutting blade 1 according to Embodiment 3, the outer surfaces 121s, 122s and 123s are three steps in that the outer surfaces 121s and 122s are two steps. It differs from the cemented carbide cutting blade 1 according to the second embodiment.

The blade portion 120 has a first portion 121 and a second portion 122 from the tip side. The outer surface 121s has a protrusion 120t. The protrusion 120t is located outside the straight line S. The angle formed by the outer surfaces 121s, 122s with respect to the center line C is the largest at the outer surface 121s near the cutting edge 121t and the smallest at the outer surface 122s near the base 110.

(Embodiment 4)
FIG. 4 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 4. As shown in FIG. As shown in FIG. 4, in the cemented carbide cutting blade 1 according to Embodiment 4, the outer surface 122s has a concave shape, unlike Embodiment 3 in which the outer surface 122s has a linear shape. It differs from the cemented carbide cutting blade 1 according to this. A point 225 at a distance of 25 μm from the cutting edge 121 t in the Z-axis direction exists on the first portion 121 .

The blade portion 120 has a first portion 121 and a second portion 122 from the tip side. A protrusion 120t is present on the first portion 121 . The protrusion 120t is located outside the straight line S.

The outer surface 122s of the second portion 122 of the blade portion 120 is curved so that the angle formed with the center line C decreases as it approaches the blade tip 121t.

(Embodiment 5)
FIG. 5 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 5. As shown in FIG. As shown in FIG. 5, the cemented carbide cutting blade 1 according to Embodiment 5 differs from the cemented carbide cutting blade 1 according to Embodiment 1 in that the cutting edge 121t has a flat shape. different. The flat surface forming the cutting edge 121t may be perpendicular to the center line C or may be inclined with respect to the center line C.

(Embodiment 6)
FIG. 6 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 6. As shown in FIG. As shown in FIG. 6, in the cemented carbide cutting blade 1 according to Embodiment 6, the cutting edge 121t is sharp in that the cutting edge 121t is rounded. It is different from the manufacturing cutting blade 1. The cutting edge 121t may have a single radius of curvature, or may have a plurality of curvature radii to form a so-called compound R shape.

(Embodiment 7)
FIG. 7 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 7. As shown in FIG. As shown in FIG. 7, in the cemented carbide cutting blade 1 according to Embodiment 7, the outer surface 121s of the first portion 121 in the vicinity of the cutting edge 121t has an outward convex shape, and the first portion 121 away from the cutting edge 121t. The second portion 122 has a concave outer surface 122s. A point 225 at a distance of 25 μm from the cutting edge 121 t in the Z-axis direction exists on the first portion 121 .

(Embodiment 8)
FIG. 8 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to Embodiment 8. As shown in FIG. As shown in FIG. 8, in the cemented carbide cutting blade 1 according to Embodiment 8, the cutting edge is located at a point 20Y of Y μm (Y is an integer from 26 to 100) from the cutting edge 121t toward the base 110. and TY1 is the thickness of the blade portion 120 at the point 20Y1 Y+1 μm from the cutting edge 121t toward the base portion 110, the second blade thickness change amount TY1−TY is The integer is 0.01 μm or more and 1.85 μm or less.

Let T11 be the thickness of the blade portion 120 at a point 226 at a distance of 26 μm from the blade edge 121t in the Z-axis direction. Let T12 be the thickness of the blade portion 120 at a point 2100 at a distance of 100 μm from the blade edge 121t in the Z-axis direction.

In a vertical cross section perpendicular to the blade length direction, the outer shape of the blade portion 120 has a portion that protrudes 120t outward in a range of 100 μm from the blade edge 121t. located outside the

(Embodiment 9)
FIG. 9 is a vertical cross-sectional view of a cemented carbide cutting blade 1 according to a ninth embodiment. As shown in FIG. 9, in the cemented carbide cutting blade 1 according to the ninth embodiment, the cutting edge is positioned at a point 20Z of Z μm ( Z is an integer from 101 to 3000) from the cutting edge 121t toward the base 110. and TZ1 is the thickness of the blade portion 120 at the point 20Z1 at Z+1 μm from the cutting edge 121t toward the base portion 110, the third blade thickness change amount TZ1-TZ is all of Z from 101 to 3000 The integer is 0.01 μm or more and 1.85 μm or less.

Let T21 be the thickness of the blade portion 120 at a point 2101 at a distance of 101 μm from the blade edge 121t in the Z-axis direction. Let T22 be the thickness of the blade portion 120 at a point 2300 at a distance of 3000 μm from the blade edge 121t in the Z-axis direction.

In a longitudinal section orthogonal to the blade extension direction, the outer shape of the blade portion 120 has an outward convex portion in a range of 3000 μm from the cutting edge 121t. located outside the

(Example 1)
Using a cemented carbide cutting blade 1 having a base portion 110 of 100 μm in thickness, 20 mm in width, and 40 mm in length in the blade length direction, the characteristics thereof were confirmed.

<Material>
The sintered body used for the cutting blade is a cemented carbide containing tungsten carbide and cobalt as main components. The cobalt content used in the cemented carbide is 10% by weight. The hardness of cemented carbide is 92 in HRA (Rockwell hardness).

<Grinding>
The produced sintered body was cut into a plate shape of 100 μm in thickness, 20 mm in width and 40 mm in length by a grinding machine using a diamond grindstone, and used as a material for processing the cutting edge.

Subsequently, the above material was used to form a cutting edge portion. In the forming process, a dedicated grinder with a diamond cylindrical grindstone was used, and the material was fixed to a dedicated work rest with an adjustable angle. When the blade has two stages, the first blade has the tip angle that is the most tip with respect to one side in the direction of the long side length of 40 mm of the material, and the tip angle that is connected to it and continues to the base 110. Blades with different tip angles of the second blades were formed on both sides.

<Convex outer surface molding>
In order to form the outer surface 121s which is a convexly curved surface as shown in FIG. 1, a cylindrical grindstone having a concavely curved surface was used to process the leading end into a convex shape on both sides. Since the formation of the convex shape is a very precise process, it is very important to set the grinding conditions such as the depth of cut and the work rest angle.

<Flat outer surface molding>
In order to form the flat outer surface 121s as shown in FIG. 3, a cylindrical grindstone was used to process the leading end into a convex shape on both sides. In the case of a three-stage blade as shown in FIG. 2, a third portion 123 is provided at the time of sharpening.

<Forming concave curved outer surface>
In order to form the outer surface 122s, which is a concavely curved surface as shown in FIG. 4, a cylindrical grindstone having a convexly curved surface was used to apply concave processing to both sides of the leading end.

<Confirmation of cross section>
The cross-section was confirmed using a JEOL Schottky field emission scanning electron microscope JSM-7900F at 3,000 times. , . . . , the blade thickness (thickness of the blade portion 120) at a portion of 26 μm was measured. From the blade thickness, the amount of change in blade thickness was calculated. The results are shown in Tables 1-5.

In Table 1 and the like, "25 μm angle [°]" means that in the longitudinal section shown in FIG. , refers to the angle formed by two straight lines 325 . The slope of straight line 325 is half the blade thickness variation at point 225 . "3 μm angle [°]" means that, in the longitudinal section shown in FIG. It means the angle to make. The slope of the two straight lines is the blade thickness variation at point 203 . In the column of "outer convexity", "N" means that the outer surface 121s does not have a convexity 120t that protrudes outward from the straight line S. In the column of "outer convexity", "Y" means that the outer surface 121s has a convexity 120t that protrudes outward from the straight line S. In the "blade thickness change amount [μm]", "at 3 μm" is a value obtained by subtracting the blade thickness at a point 3 μm from the blade edge 121t from the blade thickness at a point 4 μm from the edge 121t. “A portion of 25 μm” is a value obtained by subtracting the blade thickness of a portion of 25 μm from the blade edge 121t from the blade thickness of a portion of 26 μm from the blade edge 121t. "Figure" indicates a drawing corresponding to the shape of each sample. “max/min” indicates the maximum value and minimum value of the blade thickness variation on the outer surface 121s in the range from 3 μm to 25 μm away from the blade edge 121t in the Z-axis direction.

<Cutting test>
In addition, in order to confirm the effect using the cemented carbide cutting blade created here, press cutting of a commercially available vinyl chloride plate was performed, and the cross-sectional cutting quality such as deformation and defects and chipping occurring in the cutting blade were examined. (hereinafter referred to as chipping) was observed to confirm the effect of the cemented carbide cutting blade. FIG. 10 is a perspective view of the device for explaining the cutting test. FIG. 11 is a cross-sectional view taken along line XI--XI in FIG. As shown in FIGS. 10 and 11, chucks 3001 and 3002 held the cemented carbide cutting blade 1 .

Conditions of this test (Fig. 10 and Fig. 11)
Work material: PVC plate 100, thickness 0.5 mm, width 290 mm, length 30 mm
Test equipment: Machining center V55 (stage 2004) manufactured by Makino Milling Machine Co., Ltd. and Kistler's cutting dynamometer 9255 (cutting dynamometer 2003) set. A vinyl chloride plate 100 as a work was laminated.

Cutting conditions: cutting speed 300mm/s, push amount 0.55mm, longitudinal workpiece and blade angle ±0.5°, workpiece and blade cross section angle 90°±0.5°, number of cuts 100 times, cutting interval (pitch ) 2.5 mm
Confirmation items: chipping (depth of 5 μm or more and width of 10 μm or more), cross-section quality (cross-section state due to chipping, cross-section roughness)
Tables 1 to 5 show the results of repeated cutting tests for each sample number.

Regarding chipping, the number of chippings (depth of 5 μm or more and width of 10 μm or more) is counted. If so, the evaluation was set to C.

The chipping evaluation was performed by observing the cutting edge after the cutting test described above. A measuring microscope was used in the chipping measurement method. Specifically, an Olympus measuring microscope (STM6-LM) was equipped with a 50-fold eyepiece lens and a 20-fold objective lens, and the cutting blade (XZ plane) was placed on a plane. FIG. 12 is a microscope observation photograph (microscope) observation image showing chipping of the cutting blade. Care is taken so that the cutting edge 121t of the cutting blade in FIG. 12 and the measuring stage are parallel. The blade edge 121t is focused, the blade edges 121t located at both ends of the chip 121k are aligned with the reference line in the X-axis direction of the measuring instrument, and the Y measurement value is set to "0" as a reference. The width of the chip 121k is defined as the distance between two points where the reference line in the X-axis direction in FIG. 12 intersects with the edge of the chip 121k. The lowest point in the Y direction of the chip 121k measured from the X axis is the depth of the chip 121k. At this time, it was defined that chipping 121k occurred on the cutting edge when either one of width 10 μm or more and depth 5 μm or more was satisfied.

Regarding the cross-sectional state due to chipping, if there is no scratch, the evaluation is A, if there is a scratch but is acceptable (scratch length is 10 μm or less), the evaluation is B, and if there is a scratch and is unacceptable (scratch length is over 10 μm) ), the evaluation was C. The length of the scratch was measured by imaging at 3,000 times using a Schottky field emission scanning electron microscope JSM-7900F manufactured by JEOL Ltd.

Regarding cross-sectional roughness, if the cross-sectional surface roughness Sa (arithmetic mean height ISO25178) is 0.05 μm or less, the evaluation is A, and if the cross-sectional surface roughness Sa is greater than 0.05 μm and 0.15 μm or less, the evaluation is B. , the evaluation was C if the surface roughness Sa exceeded 0.15 μm. The surface roughness Sa is measured using a non-contact surface roughness measuring device using a white interferometer. Specifically, it was measured using a non-contact three-dimensional roughness measuring device (Nexview (registered trademark)) manufactured by Zygo Corporation.

Regarding the cross-section quality, when the evaluation was A for both the cross-section state due to chipping and the cross-section roughness, the cross-section quality was evaluated as A. When the evaluation was C for either the cross-sectional state due to chipping or cross-sectional roughness, the cross-sectional quality was evaluated as C. Other evaluation was set to B.

Regarding the overall evaluation, if the evaluation was A for both chipping and cross-section quality, the overall evaluation was A. If the evaluation was C for either chipping or cross-section quality, or if manufacturing was not possible, the overall evaluation was C. Other evaluation was set to B.

As shown in Tables 1 to 5, the thickness of the blade portion at the position of 3 μm is 0.26 μm or more and 7.00 μm or less, and the blade thickness change amount from 3 μm to 25 μm is 0.08 μm or more and 1.85 μm or less. It can be seen that the comprehensive evaluation becomes A or B when there is a convex 120t.

Furthermore, if the amount of change in blade thickness at the position of 3 μm (X=3 μm) is 0.26 μm or more and 0.93 μm or less, the overall evaluation is A, which is more preferable.

(Example 2)
Cutting blades (sample numbers 97-100, 109-112, 121-124, 133-136) having the shapes shown in Figures 1, 2, 4 and 7 were produced. These cutting blades and the cutting blade manufactured in Example 1 above were additionally processed as follows to the cutting edge of the cutting blade to prepare a cutting blade. A cutting blade was fixed on a fixed table, and a flat diamond whetstone with a grain size of #10000 was used so that the tip angle was perpendicular to the base portion 110 . The cross section confirmation method was the same as in Example 1. Cemented carbide cutting blades of sample numbers 89-92, 101-104, 113-116, 125-128, and 137-140 were thus produced.

Using the same material as in Example 1, a grindstone with a grain size of #10000 was grooved with a radius of 0.25 μm, and the groove was used to round the tip of the cutting blade. Alternatively, fine diamond or tungsten carbide particles (1 μm or less recommended) are suspended in a liquid such as water, and R processing is performed by adjusting the flow rate, injection angle, and time to make the suspension collide with the blade. . The cross section confirmation method was the same as in Example 1. Cemented carbide cutting blades of sample numbers 93-96, 105-108, 117-120, 129-132, and 141-144 were thus prepared. These details are shown in Tables 6-10.

The cemented carbide cutting blades in Tables 6-10 were evaluated in the same manner as in Example 1. The results are shown in Table 6-10.

In the "figure" of Table 6, etc., "3, 5" indicates that the cutting edge 121t of the cemented carbide cutting blade 1 of FIG. 3 is flattened as shown in FIG. "1,5", "2,5", "4,5", and "7,5" are also similar to the cutting edge 121t of the cemented carbide cutting blade 1 shown in FIGS. is flattened.

"3, 6" indicates that the cutting edge 121t of the cemented carbide alloy cutting blade 1 shown in FIG. 3 is rounded as shown in FIG. "1,6", "2,6", "4,6", and "7,6" are also similar to the cutting edge 121t of the cemented carbide cutting blade 1 shown in FIGS. is rounded. It can be seen that Tables 6 to 10 show the same tendency as Tables 1 to 5.

(Example 3)
Cutting blades (Sample Nos. 145-160) having the shape of FIG. 8 were produced. The thickness of the base portion 110 was set to 100 μm to 400 μm. Other material size, sharpening, and outer surface formation conform to Example 1. The tip end of these cutting blades was machined in the same manner as in Example 2 so that the angle of the tip was perpendicular to the base 110 . The cross section confirmation method was the same as in Example 1. Cemented carbide cutting blades of sample numbers 161-176 were thus produced. In addition, in the same manner as in Example 2, the tip portion was subjected to R processing. The cross-sectional confirmation was the same as in Example 1. At this time, the photographing magnification of the Schottky field -emission scanning electron microscope was such that the cross section could be observed in one field of view. A microscope with a length measurement function can also be substituted for this. Cemented carbide cutting blades of sample numbers 177-192 were thus produced. These details are shown in Tables 11-13.

The cemented carbide cutting blades in Tables 11-13 were evaluated in the same manner as in Example 1. The results are shown in Tables 11-13.

It can be seen that Tables 11 to 13 show the same tendency as Tables 1 to 6.
(Example 4)
A cutting blade (Sample No. 193-208) having the shape of FIG. 9 was produced. The thickness of the base portion 110 was set to 100 μm to 6000 μm. Other material size, sharpening, and outer surface formation conform to Example 1. The tip end of these cutting blades was machined in the same manner as in Example 2 so that the angle of the tip was perpendicular to the base 110 . The cross section confirmation method was the same as in Example 1. Cemented carbide cutting blades of sample numbers 209-224 were thus produced. In addition, in the same manner as in Example 2, the tip portion was subjected to R processing. The cross section confirmation method was the same as in Example 3. Cemented carbide cutting blades of sample numbers 225-240 were thus produced. These details are shown in Tables 14-16.

The cemented carbide cutting blades in Tables 14-16 were evaluated in the same manner as in Example 1. The results are shown in Tables 14-16.

It can be seen that Tables 14 to 16 show the same tendency as Tables 1 to 6.
In addition, "8, 5" in the "figure" of Table 12 and the like indicates that the cutting edge 121t of the cemented carbide cutting blade 1 of Fig. 8 is flattened as shown in Fig. 5 . Similarly, "9, 5" indicates that the cutting edge 121t of the cemented carbide cutting blade 1 of FIG. 9 is flattened as shown in FIG.

"8, 6" indicates that the cutting edge 121t of the cemented carbide alloy cutting blade 1 shown in FIG. 8 is rounded as shown in FIG. Similarly, "9, 6" indicates that the cutting edge 121t of the cemented carbide alloy cutting blade 1 of FIG. 9 is rounded as shown in FIG.

The embodiments and examples disclosed this time are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all changes within the meaning and scope equivalent to the scope of the claims.

1 cemented carbide cutting blade, 100 vinyl chloride plate, 110 base, 120 blade, 120t convex, 121 first part, 121k chipping, 121s, 122s, 123s outer surface, 121t cutting edge, 122 second part, 203,225 points , 325 tangential line, 2001 double-sided adhesive sheet, 2002 acrylic plate, 2003 cutting dynamometer, 2004 stage, 3001, 3002 chuck.

Claims (4)

a base;
A blade portion provided on an extension of the base portion and having a shape in which the thickness decreases toward the cutting edge, which is the most distal portion,
The thickness of the blade portion at a position of 3 μm from the blade edge toward the base portion is 0.26 μm or more and 7.00 μm or less,
The thickness of the blade portion at a position of X μm (X is an integer from 3 to 25) from the blade edge toward the base is TX, and the thickness of the blade portion at a position of X + 1 μm from the blade edge toward the base is TX1. when the first blade thickness change amount TX1-TX is 0.08 μm or more and 1.85 μm or less where X is an integer of 3 to 25,
In a longitudinal section perpendicular to the blade span direction, the outer shape of the blade has an outwardly convex portion in a range of 25 μm from the blade edge toward the base, and the convex portion extends from the blade edge and from the blade edge to the base. Cemented carbide cutting blade located outside the straight line connecting the 25 μm points. 2. The cemented carbide cutting blade according to claim 1, wherein said first blade thickness change amount TX1-TX when said X is 3 is 0.26 μm or more and 0.93 μm or less. The thickness of the blade portion at a position Y μm (Y is an integer from 26 to 100) from the blade edge toward the base is TY, and the thickness of the blade portion at a position Y+1 μm from the blade edge toward the base is TY1. 3. The cemented carbide cutting blade according to claim 1 or 2, wherein the second blade thickness change amount TY1-TY is 0.01 μm or more and 1.85 μm or less where Y is an integer of 26 to 100. The thickness of the blade portion at a position Z μm (Z is an integer from 101 to 3000) from the blade edge toward the base is TZ, and the thickness of the blade portion at a position Z + 1 μm from the blade edge toward the base is TZ1. 4. The cemented carbide according to any one of claims 1 to 3, wherein the third blade thickness change amount TZ1-TZ is 0.01 μm or more and 1.85 μm or less where Z is an integer from 101 to 3000 Alloy cutting blade.

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